Meh, I would think they could play it off as "Hey, don't you think Zach looks like Dan?", which looks wise he reminds me of him at times, and let that person go and tell someone. If it came back to them, they could say I just thought you looked like him. However, if they have to say "I know for a fact Zach and Dan are brothers", I could see that backfiring.
I honestly think one of the members from TA will win the game, I just hope these stupid challenges don't cost one of them a shot at $500K.
How funny was it when they were using their code words? I was literally laughing out loud!